Mortgage Banking (Schedule of Mortgage Servicing) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of year		$ 1,210,000	$ 2,161,000	$ 493,000
Capitalized servicing right fees upon sale(1)	[1]	22,000	9,000	294,000
Amortization charged against mortgage servicing fee income(1)	[1]	(430,000)	(734,000)	(231,000)
Valuation adjustment		223,000	226,000	3,000
Balance at end of year		1,025,000	1,210,000	2,161,000
Valuation Allowance:
Balance at beginning of year		(230,000)	(4,000)	(1,000)
(Increase) decrease in impairment reserve(1)	[1]	223,000	(226,000)	(3,000)
Balance at end of year		(7,000)	(230,000)	(4,000)
Fair value, beginning of year		1,701,000	2,947,000	1,447,000
Fair value, end of year		1,766,000	1,701,000	2,947,000
SBM Financial, Inc. [Member]
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Capitalized servicing right fees upon sale(1)		$ 0	$ 0	$ 1,608,000

[1] Reported within mortgage banking income, net on the Company's consolidated statements of income.